diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2016-04-09 17:53:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-30 09:26:55 -0700 |
| commit | 807c8d81f4ec441241cafa3034c58df721fee869 (patch) | |
| tree | 83402ad7f36b135d15d1aa6686ff26aa186b3dec /drivers/tty/serial/serial_core.c | |
| parent | 5604a98e2f95d6221852960a3363588f40d78e22 (diff) | |
| download | linux-807c8d81f4ec441241cafa3034c58df721fee869.tar.bz2 | |
tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.
Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 64a5c00d7468..2471380fb92e 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1418,12 +1418,12 @@ static void uart_close(struct tty_struct *tty, struct file *filp) uart_change_pm(state, UART_PM_STATE_OFF); spin_lock_irq(&port->lock); } + spin_unlock_irq(&port->lock); + tty_port_set_active(port, 0); /* * Wake up anyone trying to open this port. */ - clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); - spin_unlock_irq(&port->lock); wake_up_interruptible(&port->open_wait); mutex_unlock(&port->mutex); @@ -1501,13 +1501,13 @@ static void uart_hangup(struct tty_struct *tty) pr_debug("uart_hangup(%d)\n", tty->index); mutex_lock(&port->mutex); - if (port->flags & ASYNC_NORMAL_ACTIVE) { + if (tty_port_active(port)) { uart_flush_buffer(tty); uart_shutdown(tty, state); spin_lock_irqsave(&port->lock, flags); port->count = 0; - clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); spin_unlock_irqrestore(&port->lock, flags); + tty_port_set_active(port, 0); tty_port_tty_set(port, NULL); if (!uart_console(state->uart_port)) uart_change_pm(state, UART_PM_STATE_OFF); |